water on the land Flashcards
(27 cards)
what are three points in a river
upper lower middle
whats the two erosion which change the cross profile
vertical and lateral
three characteristics of upper course
narrow v shape valley shallow
three characteristics of middle section
gently sloping wider deeper
three characteristics of lower course
wide flat deep
four process of erosion
hydraulic action abrasion attrition solution
whats hydraulic action
the force of the water breaks rock
whats abrasion
rocks scrape and rub the channel wearing it away
whats attrition
eroded rocks smash into each other breaking into smaller fragments
whats solution
river water dissolves some types of rock eg chalk and limestone
types of transportation
traction saltation suspension solution
what size particles is traction
large rocks
how are the pebbles in saltation moved
bounce along bed
whats suspension
small particles like silt are carried along
whats solution
soluble materials dissolve in water and are carried along
whats a meander
a large bend in the river
where are meanders found
middle and lower course
which part of the river is a slipoff slope made
inside of the bend
whats on the outside of a meander
river cliff
whys a river cliff on the outside
faster water erodes the outside and doesn’t deposit anything
what can form from a meander
oxbow lake
whats a levees
a natural embankment
whats lag time
the time between peak rainfall and peak discharge
whats lag time
the time between peak rainfall and peak discharge
